Valve.



G. L. GROOK. VALVE.

APPLICATION FILED SEPTA, 1908.

933 ,698', Patented Sept. 7, 1909.

witnesses 4 1" OZ Mfl. 9 620 708 (ma/E,

UNITED STATES PATENT OFFICE.

GEORGE LOUIS 0300K, OF INDIANAPOLIS, INDIANA, ASSIGNOR 'IO ATLAS ENGINE WORKS, TRUSTEE, OF INDIANAPOLIS, INDIANA, A CORPORATION OF INDIANA.

VALVE.

Specification of Letters Patent.

Patented Sept. 7, 1909.

Application filed September 24, 1908. Serial No. 454,661.

To all whom it may concern:

Be it known that I, Gnonon LOUIS CnooK, a citizen of the United States, residing at Indianapolis, in the county of Marion and 5 State of Indiana, have invented certain new and useful Improvements in Valves, of which the following is a specification.

It is almost universal practice in the construction of internal combustion engines to provide, for the release of the spent gases, a puppet valve made of steel, With its seat on the inside of the wall or head of the cylinder or combustion chamber. The stem of the valve projects through a'guide sleeve attached to or forming a part of the exhaust passage and at its outer end is reached by the mechanism which operates the valve. That portion of the valve stem which is within the exhaust passage, between the guide sleeve and the valve disk, is exposed to the exhaust gases, which have a very corrosive and destructive action upon it, rendering frequent renewal necessary.

The object of my invention is to provide a means for protecting the valve stem from this action of the hot exhaust gases.

The character of the duty required of the exhaust valve is such as to subject it to a continual succession of shocks and strains so severe as to necessitate the utiaoststrength and lightness of material procuiable. Nothing has yet been found better adapted to the service than high qualit steel. But steel as before mentioned, is injuriously affected by the exhaust gases. Bronze, which rivals steel in strength, is subject to the same defeet, while cast iron, which is much too weak a material to stand the strains to which the valve stem is subjected, is but little allected thegases. Taking advantage of this 0 served 'fact, I )rolong the cast iron guide sleeve into the ex aust passage so as to cover and protect the valve stem. It the guide sleeve we're to extend quite to the 'valve disk so as to cover the whole stem when the valve is closed, there would still be a portion of the stem exposed when the valve is opened. 'lhereforc, I make a tightly fitting sleeve a little longer than the portion of the valve stem which is exposed by opening the valve,

and fasten it in any convenient manner around the valve stem next to the disk, and I make the guide sleeve thick enough to allow of counter-boring the opening throu .h which the valve stem asses so that tile sleeve which fastened around the valve stem may tell-scope a sullicient distance into the guide sleeve when the valve is closed. 'l'hus. whether the valve be opened or closed the valve stem will he completely covered by the cast iron sleeves, and the corrosive gases being thus prevented from reaching it, will remain intact and fit tor service indefinitely.

This device is fully illustrated in the'drawing hereto attached which forms part of this specification.

The drawing represents a sectional view of the valve and its adjuncts.

In the drawings, 10 indicates a portion of the engines cylinder which serves as a combustion chamber, 11 the exhaust valve chamher, the neck 12 of which ma be inserted either in the side of the cylin er, or in the cylinder head. In the bottom of the neck 12 is formed the seat 13 for the valve disk 14 the stem 15 of which bears the protecting sleeve 16 of cast iron fastened thereon. Sleeve 16 telesco es closely into the counterbore of the gui e sleeve 17 which may be integral with the structure 18. The valve stem 15 projects through the guide sleeve 17 and is provided on its outer end with a button 19 against which abutsa sprin 20 which serves to hold the valve closed. 'hen the valve is opened the spent gases flow art through the valve seat 13 into the who chamber 11 and thence through the 0x11. orifice 22 and the exhaust pipe 23 into atmosphere. The spring 20 rests upon a washer 24 of asbestos or other suitable noneonducting material which roteets the spring from in'ury by heat. T e forms and arrangement 0 these parts may be modified as conditions may require without aflectmg the validity of my invention.

I claim as my mventionz- An exhaust valve structure eomprisinie main hollow body hhvin a non-corrodi le valve-stem guide CountenIJored at its lower end, a valve haying a corrodible stem pass-- i this 17th day of September, A. D. one thouing through send guide and its eouuterbore F mud nine hundred and eighi.

and a sleeve of non-c0rrodible material 1 cured to the stem adjacent the valve and fit (mum 5 tin the eounterbore of the guide. W ituesses:

I n witness whereof, I have hereunto set Amuun M. H001),

my hand and seal at Indianapolis, Indiana, 'Inonms W. MoMuANs. 

